Albert, I have 2 NDs. This was my original one, and it has a small flaw when I shoot RAW files (a line of dead pixels) which I thought was the fault of the horrid Contax software... and never discovered was real until Adobe added the ND to PSCS. Of course Contax completely ignored me. So I just use it to shoot J-Pegs and Tiffs. Tiffs have less compression and produce a bigger file, so I use it if I think I'll be doing something serious with a photo. The thin line is not there in Tiff or J-peg fi